Is the LWS detector sensitivity altitude dependent?
No. The original LWS lacked a thermal control system, thus allowing the detector temperature to fluctuate by up to 3°K depending on the dewar attitude (elevation). Because the quantum efficiency and gain (etaG) of BIB detectors is strongly temperature dependent, the response of the original LWS thus varied with elevation. The new LWS detector no longer has an attitude (elevation) dependence due to a precision closed-loop thermal control system which maintains the detector at its optimum operating temperature of 8.50±0.02 K.
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